Copyright (C) 1992, 1997-2002, 2004-2017 Free Software Foundation, Inc.

  Copying and distribution of this file, with or without modification,

  are permitted in any medium without royalty provided the copyright

  notice and this notice are preserved.

Mike Haertel wrote the main program and the dfa and kwset matchers.

Arthur David Olson contributed the heuristics for finding fixed substrings

at the end of dfa.c.

Richard Stallman and Karl Berry wrote the regex backtracking matcher.

Henry Spencer wrote the original test suite from which grep's was derived.

Scott Anderson invented the Khadafy test.

David MacKenzie wrote the automatic configuration software use to

produce the configure script.

Authors of the replacements for standard library routines are identified

in the corresponding source files.

The idea of using Boyer-Moore type algorithms to quickly filter out

non-matching text before calling the regexp matcher was originally due

to James Woods.  He also contributed some code to early versions of

GNU grep.

Mike Haertel would like to thank Andrew Hume for many fascinating discussions

of string searching issues over the years.  Hume & Sunday's excellent

paper on fast string searching (AT&T Bell Laboratories CSTR #156)

describes some of the history of the subject, as well as providing

exhaustive performance analysis of various implementation alternatives.

The inner loop of GNU grep is similar to Hume & Sunday's recommended

"Tuned Boyer Moore" inner loop.

More work was done on regex.[ch] by Ulrich Drepper and Arnold

Robbins. Regex is now part of GNU C library, see this package

for complete details and credits.

Arnold Robbins contributed to improve dfa.[ch]. In fact

it came straight from gawk-3.0.3 with small editing and fixes.

Many folks contributed.  See THANKS; if I omitted someone please

send me email.

Alain Magloire maintained GNU grep until version 2.5e.

Bernhard "Bero" Rosenkränzer <bero@arklinux.org> maintained GNU grep until

version 2.5.1, ie. from Sep 2001 till 2003.

Stepan Kasal <kasal@ucw.cz> maintained GNU grep since Feb 2004.

Tony Abou-Assaleh <taa@acm.org> maintains GNU grep since Oct 2007.

Jim Meyering <jim@meyering.net> and Paolo Bonzini <bonzini@gnu.org>

began maintaining GNU grep in Nov 2009.  Paolo bowed out in 2012.

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